 Hello and welcome to the session. In this session we discussed the following question which says, a man purchased some eggs at 2 for Rs 5 and sold them at 3 for Rs 10. Does he gain Rs 100 in all? How many eggs did he purchase? We know that gain is equal to the selling price of S P minus the cost price C P. This is the key idea to be used for this question. Now let's move on to the solution. We need to find the number of eggs that the man purchased. So we assume, let the number of eggs the man purchased be equal to X. Now in the question given that cost price of 2 eggs is Rs 5. So from here we have cost price of 1 egg is equal to Rs 5 upon 2. This means that cost price of X X that the man purchased would be equal to Rs 5 upon 2 into X and we are also given that the selling price of 3 eggs is Rs 10. So from here we have selling price of 1 egg is equal to Rs 10 upon 3 and selling price of X X is equal to Rs 10 upon 3 into X. That is we now have cost price of X X is equal to Rs 5 X upon 2 and the selling price of X X is Rs 10 X upon 3. Now from here we get gain is equal to selling price of X X minus the cost price of X X and this is equal to Rs 10 X upon 3 minus Rs 5 X upon 2 that is equal to Rs 10 X upon 3 minus 5 X upon 2 equal to Rs 5 X upon 6. This is the gain. Now in the question we have that he gained Rs 100 and all that means this gain Rs 5 X upon 6 is equal to Rs 100. So from here we can easily find out the value for X which is equal to 100 into 6 upon 5. Now 5 20 times is 100 so this is equal to 20 into 6 equal to 120 and we had assumed X to be the number of X purchased by man and this is equal to 120. Hence our final answer is 120. So this completes the session hope you have understood the solution for this question.